JPS63137869A - Automatic paper thickness adjustor for printing head - Google Patents

Abstract

PURPOSE:To facilitate removal of a printing paper, by separating the printing paper from a printing head by use of a driving body of an automatic paper thickness adjustor upon a paper jam. CONSTITUTION:Where a printing paper 3 is not discharged even after completion of a paper-feeding action required in the case of normal paper feeding and a jam sensor 12 continues detecting the paper 3, it is judged that a paper jam is generated in a printer, and a CPU 13 stores printing data into a RAM 17, stops printing and gives a paper jam indication to the operator. Further, the CPU 13 operates a driver 15 to drive a paper thickness adjusting motor 6, whereby a main shaft 4 is eccentrically rotated clockwise, and a printing head 1 is moved upward by a maximum rise quantity of 0.8mm corresponding to an initial position. By releasing a paper bail roller, the operator can easily drawn out the paper 3 from between the head 1 and a flat platen 8.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an automatic paper thickness adjustment device that appropriately adjusts the distance between the platen of a printing device and the printing gutter according to the paper thickness of printing paper. When the printing paper jams, the interval is widened. The present invention relates to an automatic paper thickness adjustment device for a print head as described above.

[Prior art]

In a wire dot printing device, it is necessary to bring the print head into close contact with the printing paper in order to print clearly. 2. Description of the Related Art Conventionally, in order to make it possible to change the distance between a print head and a platen according to the thickness of printing paper, an automatic paper thickness adjustment device has been provided that automatically adjusts the movement of the print head.

Further, when the printing device receives a printing command, the print head performs printing, and the paper feed roller performs sequence control in conjunction with printing, such as feeding the printing paper. If the printing paper gets stuck inside the device during paper feeding and becomes combed (paper jam), the jam detection device normally detects the paper jam and automatically stops the printing device. There is.

[Problem that the invention seeks to solve]

However, when removing the print paper that caused the paper jam (in case K), the print head is in close contact with the print paper so as to have slip resistance due to the action of the automatic paper thickness adjustment device, so the operator cannot forcefully pull it. In some cases, there were problems such as the paper being torn, taking a long time to remove the paper, and in some cases damaging the tip of the print head (paper guide, ribbon mask, etc.).

This invention solves the above problem, and when a paper jam occurs, the driver of the automatic paper thickness adjustment device is used to move the print head away from the print paper, making it easy to remove the print paper. The purpose is to rub.

[Means for solving problems]

The present invention is characterized in that the print head is movable by a driver 7 so that the distance between the print head and the platen can be changed. paper thickness adjusting means for adjusting the driving body;
If the printing paper is jammed during printing by the print head, the jam detection means detects this and outputs a jam signal, and the spacing adjusted by the paper thickness adjustment means in response to the jam signal is detected. Control the driving body so that it expands
The present invention provides an automatic paper thickness adjustment device for a print head, characterized in that it is equipped with a jam control means.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 denotes a wire focus type print head, and this printing gutter 1 is supported by a carrier frame 2 and is slidable on a main shaft 4 disposed perpendicular to the paper feeding direction of printing paper 3. This is supported. A supporting shaft 5a of a gear 5 is fixed eccentrically at one end of the main shaft 1, and the gear 5 and a gear 7 of a stepping motor 6 for adjusting paper thickness are meshed with each other.Stamping motor 6
becomes the initial position when the tip of the head is furthest away from the platen. Therefore, the rotation of the gear 7 causes the main shaft 4 to rotate eccentrically, so that the print head 1 is moved so that the distance between the leading edge printing portion 1a and the flat platen 8 can be changed. Note that an ink ribbon 9. is placed between the tip of the printing section 1a and the printing paper 3. Ribbon mask 10.
A paper guide 11 (both ends are omitted from the drawing) is arranged and attached to the carrier frame 2. Further, the shaft 5a of the gear 5 and the stamping motor (driver) 6 are supported by a machine frame (not shown), and the other end of the main shaft 4 is supported by the machine frame so as to be eccentrically rotatable.

1. Go to the second printing. Carrier frame 2. Main shaft・1. The gears 5, 7 and the motor 6 constitute print head moving means.

Reference numeral 12 is a jam sensor 12 located on the side of the flat platen 8 in the filter paper feeding direction ((located in the machine frame and detects the passage of the printing paper 3. , which is detected in conjunction with a timer to be described later and generates a jam signal, and constitutes a jam detection means.

Next, a circuit for controlling the above mechanism will be explained based on the block diagram f shown in FIG.

The print paper detection function of the jam sensor 12 includes an ON signal when the print paper 3 is detected or not detected, and an OF signal.
By inputting the F signal to CPU 3, the R,
0M14 constitutes a paper thickness adjusting means that supplies the stored program to the CPU 13, controls the driver 15 for moving the gutter to print, and adjusts the stepping motor 6 for adjusting the paper thickness.

Further, a print signal 16 is input to the CPU 13 yhξ.

As a result, R,0M14 is supplied to the program 4CPU 13, the RAM 17 stores the print signal 1 (5), the print head 18 prints, the paper feed motor 19 feeds the print paper 3, and the Chiyaria motor 2o A printing means is configured to carry out printing/-printing by transferring 1 in the printing direction.

Furthermore, the jam detection means causes the CPU 13 to
Print paper 3 according to the program stored in OMI 4.
If a jam is detected, the jam display 21 indicates a jam to the operator, the printing sequence is stopped, and a jam control means is configured to control the driver 15 of the print head moving means and adjust the stepping motor 6. Ru.

Next, the operation of the printing device will be explained in degrees Celsius based on the flowchart shown in FIG.

When the printing paper 3 is interposed between the paper 1 and the flat platen 8 for printing, and the jam sensor (paper sensor) 12 detects the printing paper 3 and becomes 0N-f, automatic paper thickness adjustment is first performed. That is, according to the program stored in the ROM 14, the CPU 13 drives the paper thickness adjustment stepping motor 6 from the initial position by rotating the main shaft 4' in the counterclockwise direction in the drawing, and rotates the print head 1. descend. When the printing section 1a comes into contact with the printing paper 3,
When the motor 6 goes out of step, the motor 6 is reversed, the printing section lag is raised from the printing paper 3 by approximately 0.1, and the motor 6 is stopped. In this state, even though the paper is being fed for printing, there is strong sliding resistance, and if the printing paper is pulled too hard, it may tear.

When the print signal 16 is input to the CPUI 3, the printing device is activated and printing is executed as follows.

That is, according to the program stored in ROMt4v, R
While the print data is stored in the AM 17, the print head 18 presses the ink ribbon 9 against the print paper 3 as appropriate to print.
The carrier motor 20 moves the print head 18 in the printing direction to execute the print sequence, and the paper feed motor 19 feeds the print paper 3 to change the printing line.
Alternatively, the printing paper 3 is ejected.

If the #≠74 paper is not ejected even after the paper feeding operation required when the printing paper 3 is normally fed, and the jam sensor 12 continues to detect the printing paper 3, the paper is It is assumed that a jam (paper jam) has occurred, and C
The PU 13 stores the print data in the yRAM 17, stops printing, and displays a jam message to the operator.

Furthermore, CPUI 3 is driver 15f;! :: Activate, drive the paper thickness adjustment motor 6, and move the main/#ft 4.
is eccentrically rotated clockwise in FIG. 1, and the print head 1 is moved upward to the initial position, which is the maximum increase amount of 0.8 mm.

The operator can easily pull out the jammed print paper 3 from between the print head 1 and the flat platen 8 by releasing the paper press roller (not shown).

When a new print paper 3 is installed between the print head 1 and the flat platen 8, the CPU 13 executes the paper thickness adjustment,
Printing resumes.

〔Effect of the invention〕

Structure 9 of the present invention has a simple operation, and when a paper jam occurs, the print head that imitates the printing paper is automatically raised, making it easy to pull out and remove the paper. Became.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a control block diagram, and FIG. 3 is a flow chart. 1...Print head 6...Paper thickness adjustment motor (driver) Name of applicant Tokyo Heavy Equipment Co., Ltd. Figure 1 Figure 2 (D Figure 3)

Claims (1)

[Scope of Claims] A print head moving means in which the print head is movably associated with a drive body so that the distance between the print head and the platen can be changed, and the distance can be adjusted in accordance with the paper thickness of printing paper. a paper thickness adjusting means for adjusting the drive body; a jam detection means for detecting a jam in the case where the print paper jams during printing by the print head and outputting a jam signal; An automatic paper thickness adjustment device for a print head, comprising: a jam control means for controlling a drive body so as to widen the interval adjusted by the paper thickness adjustment means.